Core for paper rolls



April 1932- G. a. MARZOLF 1,855,251

CORE FOR PAPER ROLLS Filed Dec. 12, 1929 Patented Apr. 26, 1932 UNITED STATES PATENT OFFICE GEORGE B. MARZOLF, OF BERCHWOOD, MINNESOTA, ASSIGNOR T FARWELL OZMUN KIRK 65 00., OF ST. PAUL, MINNESOTA, A CORPORATION OF MINNESOTA CORE FOR PAPER ROLLS Application filed December 12, 1929.

My invention relates to improvements in cores upon which paper is rolled as it issues from a paper making machine or other source and from which the paper is dispensed in the subsequent use thereof.

In the manufacture of paper to be sold in the form of rolls and to be consumed from the roll, it is common to wind the paper upon cores at the source, to ship the paper upon the'cores to the points of consumption, to employ the cores during the removal of the papentherefrom and to return the cores to the source to be rewound with new stock.

Such cores, in some instances,have been constructed entirely of wood and in other instances have been constructed with tubular sheet metal bodies having end plugs of wood formed with square openings to receive the winding and dispensing shafts. Cores of such nature rapidly deteriorate in use with'the result that substantial initial investments are soon lost. Under varying weather conditions and in the reuseof such cores, their facility for application to the winding and dispensing shafts is rapidly impaired With the further result that many thereof are discarded before they have actually become destroyed. And too, the cost of such cores is relatively great.

It is an object of my invention to provide a simple, durable and relatively inexpensive core of unitary construction consisting entirely of sheet metal, which under all conditions is readily applicable to and removable from the core supporting shafts and which provides a true and uniformly rotating mounting for the stock as it is wound d upon the core and unwound therefrom.

Serial No. 413,504.

force each other as well as the surrounding body structure.

An additional object of my invention is to provide a structure, as above, wherein the tubular body is slotted to receive the leading in the details of construction hereinafter described and claimed. In the drawings:

Fig. 1 is a view of a core embodying my invention, a part of said view being shown in side elevation and a part thereof in section as on the line 11 of Fig. 2; Fig. 2 is a transverse sectional view taken as on the line 22 of Fig. 1; Fig. 3 is an end elevational view of the structure shown in Fig; 1; Fig. 4 is a detailed view of a blank from which the identical members of the insert assembly are formed; Figs. 5 and 6 are transverse sectional views illustrating alternate forms of my invention, extra truss members being shown in each instance within the various channel-like members of the insert assemblies for additionally reinforcing the core bodies longitudinally.

Reference being had to the drawings, it will be observed that the illustrated embodiment of my invention includes a tubular body 10. This body is constructed of a strip of sheet metal which is rolled into cylindrical form, the ends of the strip being turned in ward in the form of lips 11 which are slighly spaced apart to provide a slot 12 to receive the leading end of a strip of paper to be wound upon the core. These lips are foreshortened at their ends for a purpose which will hereinafter appear. Within the tubular body 10 is an insert assembly designated in its entirety by the reference letter A. This assembly consists of a plurality of identical insert members a, each developed from a sheet metal blank as shown in 4-. and which consists of a rectangular body 13 with side portions l4 foldable on lines I) to form legs 14 (Figs. 1 and 2) and with segment-like end portions 15 foldable on lines 0 to form end members 15 (Figs. 1 and 3) in the com pleted structure. Each segment is provided with a pair of extensions 16 projecting from its radial edges which are turned inward on lines (Z to form ears 16 (Figs. 1 and 2), one

ear of each segment being adapted to mate with the corresponding ear of the adjacent segment. Each of the two side portions 14 of the blank which form the legs 14 of the individual insert members a is formed at each end thereof near its'outer edge with a lug 17 Each segment 15 is formed with a pair of spaced elongated apertures 18 which receive, respectively, the corresponding lug 17 of its respective side portion 14 when the blank is developed. A plurality of developed insert members a, four in the present instance, are assembled in the relation shown in Fig. 2, the mating ears 16 preferably being arewelded together and the adjacent legs 14 of said members tacked together as points 19 between the ends thereof by arc-welding. The assembly produced is inserted endwise into the tubular body 10, one of the legs 14 being disposed closely adjacent to one of the lips 11 of the body 10 as shown'in Fig. 2. This particular leg trusses the body at the position thereof weakened by the provision of the slot 12, while the remaining legs of the insert assembly truss and effectively reinforce said body along other and longitudinally spaced lines. The webs 13 provided in the body portions 13 of the blank structures, in their combined relation, form an axial bore 20 for the core, which is angular in cross-section and of such dimensions as to freely receive a supporting shaft (not shown). In the blank, Fig. 4, each segment 15 includes an arcuate extension 21' which is turned outward on line 6 to provide a quadrant-like flange 21 (Fig. 1). These flanges in the assembled device constitute an annular projection over which the marginal portions 22 of the body 10 are rolled or turned as seen in Fig. 1. In this connection, it will now be understood that the inturned lips 11 of the body 10 are foreshortened, as above mentioned, to permit the rolling of the body 10 at its ends. Referring to Fig. 1, it will be seen that the ends of the lips 11 abut against the inner faces of the end segments 15 adjacent thereto. After the structure is assembled as above noted, the lugs 17 and adjacent apertured portions of the end segments 15 through which the lugs project and the adjacent rolled portions 22 of the body are secured each to the other as by arc-welding, the securing fillets as would result from such welding being shown in dotted lines and designated by the numerals 23.

The legs 14 of the insert members may oocupy positions coincident with chordal planes intersecting the cylindrical body blank as shown in Figs. 2 and 5, or may abut one against another in radial planes as shown in Fig. 6. In either of the constructions shown in Figs. 5 and 6 additional body trussing members as at 24 may be provided to rein force the body longitudinally. In either such instance such additional reinforcing members each consist of a strip of sheet metal bent medially longitudinally thereof, in the angular form shown, the ridge of each supporting member being disposed against the inner periphery of the body 10, while the longitudinal edges of the legs of said member are disposed in the crotches of the channel-like insert members a of the insert assembly. These additional reinforcing members are held in place longitudinally by endwise engagement with the corresponding end segments 15 and/or by the tacking of said mem bers to the channel-like members.

In the accompanying drawings there has been disclosed a structure designed to carry out the various objects of the invention, but it is to be understood that the invention is not confined to the exact features shown, as various changes may be made within the scope of the claims which follow.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. A unitary core of the character described constructed entirely of sheet metal and comprising a tubular body consisting of a cylin drically formed sheet, the meeting margins thereof being turned inwardly and forming lips slightly spaced apart and providing between them a slot to receive the leading end of a strip of paper to be wound upon the body, a reinforcing insert assembly for the body providing an axial bore square in cross section to receive a supporting shaft for the core. said assembly comprising four channel-like insert members, each developed from a sheet metal blank and consisting of a web and legs, the web having integrally formed segments at the ends thereof, the webs being disposed edge to edge to form said bore, the legs trussing the body along a plurality of spaced lines longitudinally thereof, one of said legs trussing said body therealong in near proximity to one of said lips, the segments at the extremities of the insert members forming, in combination, end portions of the core supporting the extremities of the body peripherally, said segments being turned outward at their circumferential portions to form quadrant-like flanges, the end portions of the body being turned inward to embrace said flanges, said segments being formed with inturned ears radially disposed, one ear of each segment mating with and being secured to a corresponding ear of the adjacent segment, lugs at the ends of the legs near the outer edges thereof, each of said segments being formed with a pair of elongated apertures, each registering with and receiving one of the lugs of one of the legs of its respective insert member, each lug and adjacent segment portion and adjacent inturned body portion being welded to each other.

2. A unitary core structure comprising a tubular body, a reinforcing assembly within the body providing an axial bore to receive a supporting shaft, said'assembly comprising a plurality of channel-like members, each developed from a blank of sheet material and including a web and legs, the webs, in combi nation, forming said bore, and the legs serving to truss the body longitudinally, each web having an integrally formed segment at either end thereof, the segments, in combination, forming end portions of the core and supporting the extremities of the body peripherally.

3. A unitary core structure comprising a tubular body, a reinforcing assembly within the body providing an axial bore to receive a supporting shaft, said assembly comprising a plurality of channel-like members, each developed from a blank of sheet material and including a Web and legs, the webs, in combination, forming said bore, and the legs serving to truss the body longitudinally, each web having an integrally formed segment at either end thereof, the segments, in combination, forming end portions of the core and supporting the extremities of the body peripherally, said segments being turned outward at their circumferential portions to form quadrant-like flanges, the end portions of the body being turned inward to embrace said flanges.

4. A unitary core structure comprising a tubular body, a reinforcing assembly within the body providing an axial here to receive a supporting shaft, said assembly comprising a plurality of channel-like members, each developed from a blank of sheet material and including a web and legs, the webs, in combination, forming said bore, and the legs serving to truss the body longitudinally, each web having an integrally formed segment at either end thereof, the segments, in combina tion, forming end portions of the core and supporting the extremities of the body peripherally, said segments being formed with ears turned thereon, one ear of each segment mating with and abutting the corresponding ear of the adjacent segment.

5. A unitary core structure comprising a tubular body, a reinforcing assembly within the body providing an axial bore to receive a supportingshaft, said assembly comprising a plurality of channel-like members, each developed from a blank of sheet material and including a web and legs, the Webs, in com bination, forming said bore, and the legs serving to truss the body longitudinally, each web having an integrally formed segment at either end thereof, the segments, in combination, forming end portions of the core and supporting the extremities of the body peripherally, said segments cooperating with said legs to prevent the spreading of the latter.

6. A unitary structure comprising a tubular body, a reinforcing assembly within the body providing an axial bore to receive a supporting shaft, said assembly comprising a plurality of members, each developed from a blank of sheet material and providing a web with an end portion at each end thereof, the webs, in combination, forming said bore and the end portions serving to support the body at its extremities.

7. A unitary core structure comprising a tubular body, a reinforcing assembly within the body providing an axial bore to receive a supporting shaft, said assembly comprising a plurality of channel-like members, each developed from a blank of sheet material and including a web and legs, the webs, in combination, forming said bore, and the legs serving to truss the body longitudinally, and additional means further serving to truss said body longitudinally, said means consisting of a plurality of elongated structures V-shaped in cross section, one for each channel-like member, each of said trussing structures being coextensively disposed Within its respective channel-like member and hearing edgewise along its legs in the angles of such member and along the junction of its legs against the inner surface of the tubular body.

8. A unitary core structure comprising a tubular body, reinforcing means therein providing an axial bore to receive a supporting shaft, said means including legs trussing the body, and additional trussing means com prising a plurality of elongated braces extending lengthwise of the body and cooperating with said first means and with said body to reinforce the latter longitudinally thereof.

In testimony whereof I affix my signature to this specification.

GEORGE B. MARZOLF. 

